Vd. Sevastyanov et Vi. Lyagushin, METHODS FOR CERTIFYING STANDARD SAMPLES OF U-235, U-238, AND NP-237 WITH A TARGET-NUCLIDE LAYER THICKNESS OF 0.5-3 MG CM(2)/, Measurement techniques, 40(11), 1997, pp. 1109-1114
Methods are presented for certifying standard samples of fissile mater
ials having a 0.5-3-mg/cm(2)-thick layer of a fissile material. Method
s of counting alpha particles and gamma photons are employed to certif
y standard samples of uranium and neptunium, using alpha and gamma spe
ctrometers and reference standard samples for which the number of nucl
ei in the target-nuclide has been established by several independent m
ethods.